Clip system versus direct connection

I'm wondering what the pros and cons are for using a standing seam mtl roof applied directly to the substrate versus a clip system. Specifically if there are any oil canning or telegraphing concerns with one or the other. Any help would be greatly appreciated.

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I assume you are asking about the difference between a concealed fastener system, such as a nail flange panel, and a true standing seam, which utilizes hold down clips. Most true standing seam systems use clips that allow for thermal expansion, which does minimize the oil canning associated with thermal movement. They typically hold the panel off the roof deck a small amount which will help hide uneven decking or felt fasteners.

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For the contractor, he doesn't have to carry clips with him on the roof. A panel that is elevated in some small way can prevent a lot of radiant heat transfer. The clips must have offsets. So, in addition to the relief from oil-canning, you should be able to reduce your energy bill a little more with a clip system. It sure is important here in Houston. Have you seen any wind uplift values on this nail-strip panel?

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We run a true snap lock 12" panel in our plants in oregon. It is a clipless system that works very well. We run a kynar paint system with a duracoat pigment which enables this panel to be energy star rated. As far as the expansion contraction issue it's really only a horizontal problem than a vertical problem. I've never heard a complaint on our system as to this problem.

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